Valve-gear for explosive-engines.



PATENTEE ooT.17`,19o5.

i E. E. UHLIN. VALVE GEAR EOE EXELosIvE ENGINES.

APPLICATION FILED 2020.15. 1903.

Wine ases iinrrnn STATES PATENT UEFIGE.

ERNEST RUDOLPH UHLIN, OF MCDONALD,t PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO BARRETT D. TILLINGHAST, OE MCDONALD, PENNSYL- VANIA.

VALVE-GEAR FOR EXPLOSlVE-ENGINES.

Specification of Letters Patent.

. Patented Oct. 17, 1905.'

Application filed December 15, 1903. Serial No. 185.251.

To all whom, it pta/y concern,.-

Beitknown that LERNEs'r RUDOLPH UHLIN, a citizen of the United States, residing at Mc- Donald, in the county of Washington and State of Pennsylvania, have invented new and useful Improvements in Valve-Gear for Explosive-Engines, of which the following is a specification.

The object of my invention is to provide a new and improved gas-engine, more particularly to provide new and improved means for controlling the admission of gas and air and the escape of spent gases to and from the cylinder of a four-cycle engine.

In the accompanying drawings, which illustrate applications ofv my invention, Figure 1 is a part side elevational view and a part-sectional view of an engine constructed in accordance with my invention; Eig. 2, a vertical sectional View of controlling-valve and its casing; F ig. 3, a part transverse sectional view and a part plan, the section being taken on line I I of Eig. 2; Fig. 4 a part-elevational view and a part-sectional view showing controlling-valve and its casing applied to the cylinder at a different position from that shown by Fig. 1 and a modified form of mechanism for operating the valve; and Fig. 5, a part plan and a part-sectional view, the section being taken on line II II of Fig. 2.

Referring to the drawings, 1 represents the bed, 2 the cylinder, and 3 the piston, of a fourcycle explosive-engine. The explosive mixture is introduced into the cylinder and the spent gases discharged therefrom through a valve-casing' 4,which may be applied to either a horizontal type of engine or to a vertical type and may be connected up with the cylinder in the manner shown by Fig. 1 or in the form of Fig. 4. Valve-casing4 is provided with a gas-inlet 5, air-inlet 6, and exhaust-passage 7.

A characteristic and important feature of the present invention is the means shown for controlling the admission of the explosive mixture to the cylinder and the escape of spent gases therefrom. For this purpose I employ a single valve in place of several valves, as has heretofore been the practice, thereby greatly simplifying the construction and providing means less liable to cause trouble in operation.

Valve 8, as illustrated and as preferred, consists of a hollow cylinder provided with a head 9, which latter is held on a seat, 10 by spring 11. Valve 8 is also provided with ports l2 and 13, which are adapted t0 respectively register with an exhaust-port 14 and with gas and air ports 15, formed in the valve-casing. Spring 11 surrounds astem 16, extending from an end of the valve 8, and is held in position between the outside of the valve-casing and a nut or stop 17 on stern 16. Communication between the interior of the valve-casing 4 and the cylinder is controlled by the head 9 of valve 8, and valve 8 is operatedby suitable mechanism connected with main drive-shaft 18. The valve-operating mechanisms, which will be fully hereinafter described, are arranged to effect a movement of valve 8, so that as the head 9 is moved olf its seat the exhaust-port 12 of valve 8 will simultaneously register with exhaust-port 14, thus permitting an exhaust from the cylinder through said ports to exhaust-passage 7. After the exhaust is effected a continued movement of valve 8 closes the exhaust-ports and establishes communication between the gas and air supply and the interior of the valvecasing by means of the ports 13 and 15. After the chargeof explosive mixture is drawn into the cylinder, which occurs about the time the piston completes its suction-stroke, the valve is returned and communicationv between the valve-casing and cylinder out olf.

Attention is called to the fact that the gasinlet is placed a slight distance below the airinlet, the purpose of this construction being to permit the gasto be cut olf in advance of the air upon the return of the valve at the completion of the suction-stroke. This construction is particularly shown by Fig. 2.

The means shown by Fig. 1 for operating the valve comprise a pinion 19,`mounted on shaft 18, gear 20, carried on shaft 21, and a cam 22, also carried on shaft 2l. Cam 22 is in contact with a roller 23, carried on the end of a rod 24. Said rod 24 is supported by bosses.25. A spring 26 is employed for the purpose of maintaining roller 23 against the cam.

In connection with the valve-operating mechanism I have shown a pick-blade governor comprising blade 27, pivoted weight 28, and spring 29. Blade 27 is normally in contact with valve stem or rod 16, as shown by dotted lines in Fig. l; but under abnormal speed the weight 28 causes the blade 27 to be brought out of contact with stem 16. In

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place of this pick-blade governor other suitable forms of governors may be employed.

In the form of Fig. )fthe valve is operated by a modified form of valve-operating mechanism comprising a revolving shaft 30, wormgear, (not shown,) cam 31, and connectingrod 32.

What I claim is-,

l. The combination, with an explosive-engine, of means for controlling the admission of an explosive mixture and the escape of spent gases to and from the cylinder, comprising a casing in communication with the cylinder, having a gas-inlet port, an air-inlet port, and an exhaust-port, a single tubular-valve closed at its outer end and located within the casing controlling said ports and the communication between the casing and cylinder, and means for operating the valve.

2. The combination, with an explosive-engine, a valve-casing in communication with the cylinder having' an air-supply port, aI gassupply port arranged in advance of the-airsupply port, and an exhaust-port, a single tubular valve located within the casing and provided with a head for controlling communication between the cylinder and casing, ports in the valve adapted to register with the ports in the casing, and means for moving thevalve whereby communication is first eifected between the cylinder and the exhaustport and upon a further movement of the valve between the gas and air supply ports and cylinder.

3. The combination, with an explosive-engine, a casing having a gas-inlet, an air-inlet, ports in the casing in communication with said-inlets, xa single tubular valve having its outer end closed and provided with ports arranged to registerwith -said ports for controlling1the-admission of gas and air to the interior of the casing, an exhaust-outlet, a port in the casing in communication with the exhaust-outlet, fa port in the valve arranged to register with the exhaust-port, a head on the valve controlling communication between the cylinder and casing, and means for operating the valve.

In testimony whereof I have signed my name to this specifica-tion in the presence of two subscribing witnesses.

ERNEST RUDOLPH UHLIN.

Witnesses MARGARET HUGHES,

W. G. DooLITTLE. 

